Hunter.io plan tiers (reference, August 2026)
| Plan | Credits/month | Monthly billing | Annual billing |
|---|---|---|---|
| Free | 50 | $0 | $0 |
| Starter | 2,000 | $49/mo | $34/mo |
| Growth | 10,000 | $149/mo | $104/mo |
| Scale | 25,000 | $299/mo | $209/mo |
Why credit-tier billing behaves differently
Most APIs on this site price per call or per token β cost grows smoothly with volume. Email-finder and data-enrichment tools like Hunter.io, Apollo.io and similar lead-gen platforms instead sell a monthly credit allotment bundled into a plan. Use 1,999 credits on the Starter tier and you pay $49 (or $34 annual); use 2,001 and you're forced onto Growth at $149 (or $104 annual) β a 3x price jump for two extra lookups. That makes the real cost curve a staircase, not a line: it pays to batch enrichment runs to land just under a tier boundary, and to route verification-only workloads (0.5 credit each) separately from fresh lookups (1 credit each) since blending them changes which tier you need. Annual billing saves roughly 30% per tier but locks in a fixed monthly allotment for a year, which is a bad trade if your outbound volume is seasonal or a new product could 2x your lookup volume mid-year.
How this calculator works
The Email Finder & Verification Credit Cost Calculator models Hunter.io's tiered credit billing. It takes your emails to find per month (Domain Search / Email Finder, 1 credit each) and emails to verify per month (Email Verifier, 0.5 credit each), sums them into a total monthly credit need, then picks the cheapest plan tier β Free (50 credits), Starter (2,000), Growth (10,000) or Scale (25,000) β whose allotment covers that total. The billing-cycle toggle switches between list monthly pricing and the ~30%-cheaper annual rate.
The trade-off to watch is tier headroom versus overpaying. Because credits are sold in fixed steps, landing just above a tier boundary means you're paying for a much larger allotment than you use β the calculator shows credits used versus allotted so you can see how much headroom (waste) sits in your recommended plan. If you're consistently near the top of a tier, that's a signal to negotiate a custom enterprise allotment instead of jumping a full step.
Frequently asked questions
How does email-finder credit pricing work?
Providers like Hunter.io sell monthly plan tiers with a fixed pool of credits. Finding an email via Domain Search or Email Finder costs 1 credit; verifying an email costs 0.5 credit. Credits reset each month and unused credits do not roll over, so you pay for the tier that covers your peak usage, not your average.
Why is this different from a pay-per-call API?
There is no linear per-unit rate. You buy a step (a plan tier with N credits/month); going one credit over the tier forces an upgrade to the next full tier, so effective cost per email jumps in stair-steps rather than growing smoothly with volume.
How much cheaper is annual billing?
Hunter.io's annual billing is roughly 30% cheaper per month than monthly billing at every paid tier, but it locks in a year of credits at a fixed monthly allotment even if your volume is seasonal.